# Copyright 2003 Christopher Currie
# Copyright 2006 Dave Abrahams
# Copyright 2003, 2004, 2005, 2006 Vladimir Prus
# Copyright 2005-2007 Mat Marcus
# Copyright 2005-2007 Adobe Systems Incorporated
# Copyright 2007-2010 Rene Rivera
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)

#  Please see http://article.gmane.org/gmane.comp.lib.boost.build/3389/
#  for explanation why it's a separate toolset.

import feature : feature ;
import toolset : flags ;
import type ;
import common ;
import generators ;
import path : basename ;
import version ;
import property-set ;
import regex ;
import errors ;

## Use a framework.
feature framework : : free ;

## The MacOSX version to compile for, which maps to the SDK to use (sysroot).
feature macosx-version : : propagated link-incompatible symmetric optional ;

## The minimal MacOSX version to target.
feature macosx-version-min : : propagated optional ;

## A dependency, that is forced to be included in the link.
feature force-load : : free dependency incidental ;

#############################################################################

_ = " " ;

if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
{
    .debug-configuration = true ;
}

feature.extend toolset : darwin ;
import gcc ;
toolset.inherit-generators darwin : gcc : gcc.mingw.link gcc.mingw.link.dll ;

generators.override darwin.prebuilt : builtin.prebuilt ;
generators.override darwin.searched-lib-generator : searched-lib-generator ;

# Override default do-nothing generators.
generators.override darwin.compile.c.pch   : pch.default-c-pch-generator   ;
generators.override darwin.compile.c++.pch : pch.default-cpp-pch-generator ;

type.set-generated-target-suffix PCH : <toolset>darwin : gch ;

toolset.inherit-rules darwin : gcc : localize ;
toolset.inherit-flags darwin : gcc
  :  <runtime-link>static
     <architecture>arm/<address-model>32
     <architecture>arm/<address-model>64
     <architecture>arm/<instruction-set>
     <architecture>x86/<address-model>32
     <architecture>x86/<address-model>64
     <architecture>x86/<instruction-set>
     <architecture>power/<address-model>32
     <architecture>power/<address-model>64
     <architecture>power/<instruction-set>
     <inlining>full  ;

# Options:
#
#   <root>PATH
#       Platform root path. The common autodetection will set this to
#       "/Developer". And when a command is given it will be set to
#       the corresponding "*.platform/Developer" directory.
#
rule init ( version ? : command * : options * : requirement * )
{
    # First time around, figure what is host OSX version
    if ! $(.host-osx-version)
    {
        .host-osx-version = [ MATCH "^([0-9.]+)"
          : [ SHELL "/usr/bin/sw_vers -productVersion" ] ] ;
        if $(.debug-configuration)
        {
            ECHO notice\: OSX version on this machine is $(.host-osx-version) ;
        }
    }

    # - The root directory of the tool install.
    local root = [ feature.get-values <root> : $(options) ] ;

    # - The bin directory where to find the commands to execute.
    local bin ;

    # - The configured compile driver command.
    local command = [ common.get-invocation-command darwin : g++ : $(command) ] ;

    # The version as reported by the compiler
    local real-version ;

    # - Autodetect the root and bin dir if not given.
    if $(command)
    {
        bin ?= [ common.get-absolute-tool-path $(command[1]) ] ;
        if $(bin) = "/usr/bin"
        {
            root ?= /Developer ;
        }
        else
        {
            local r = $(bin:D) ;
            r = $(r:D) ;
            root ?= $(r) ;
        }
    }

    # - Autodetect the version if not given.
    if $(command)
    {
        # - The 'command' variable can have multiple elements. When calling
        #   the SHELL builtin we need a single string.
        local command-string = $(command:J=" ") ;
        real-version = [ MATCH "^([0-9.]+)"
            : [ SHELL "$(command-string) -dumpversion" ] ] ;
        version ?= $(real-version) ;
    }

    .real-version.$(version) = $(real-version) ;

    # - Define the condition for this toolset instance.
    local condition =
        [ common.check-init-parameters darwin $(requirement) : version $(version) ] ;

    # - Set the toolset generic common options.
    common.handle-options darwin : $(condition) : $(command) : $(options) ;

    real-version = [ regex.split $(real-version) \\. ] ;
    # - GCC 4.0 and higher in Darwin does not have -fcoalesce-templates.
    if [ version.version-less $(real-version) : 4 0 ]
    {
        flags darwin.compile.c++ OPTIONS $(condition) : -fcoalesce-templates ;
    }
    # - GCC 4.2 and higher in Darwin does not have -Wno-long-double.
    if [ version.version-less $(real-version) : 4 2 ]
    {
        flags darwin.compile OPTIONS $(condition) : -Wno-long-double ;
    }
    # - GCC on Darwin with -pedantic, suppress unsupported long long warning
    flags darwin.compile OPTIONS $(condition)/<warnings>pedantic : -Wno-long-long ;

    # - GCC on El Capitan (10.11) does not support -finline-functions
    if "10.11.0" <= $(.host-osx-version)
    {
        flags darwin.compile OPTIONS $(condition)/<inlining>full : -Wno-inline ;
    }

    # - The symbol strip program.
    local strip ;
    if <striper> in $(options)
    {
        # We can turn off strip by specifying it as empty. In which
        # case we switch to using the linker to do the strip.
        flags darwin.link.dll OPTIONS
            $(condition)/<main-target-type>LIB/<link>shared/<address-model>32/<strip>on : -Wl,-x ;
        flags darwin.link.dll OPTIONS
            $(condition)/<main-target-type>LIB/<link>shared/<address-model>/<strip>on : -Wl,-x ;
        flags darwin.link OPTIONS
            $(condition)/<main-target-type>EXE/<address-model>32/<strip>on : -s ;
        flags darwin.link OPTIONS
            $(condition)/<main-target-type>EXE/<address-model>/<strip>on : -s ;
    }
    else
    {
        # Otherwise we need to find a strip program to use. And hence
        # also tell the link action that we need to use a strip
        # post-process.
        flags darwin.link NEED_STRIP $(condition)/<strip>on : "" ;
        strip =
            [ common.get-invocation-command darwin
                : strip : [ feature.get-values <striper> : $(options) ] : $(bin) : search-path ] ;
        flags darwin.link .STRIP $(condition) : $(strip[1]) ;
        if $(.debug-configuration)
        {
            ECHO notice\: using strip for $(condition) at $(strip[1]) ;
        }
    }

    # - The archive builder (libtool is the default as creating
    #   archives in darwin is complicated.
    local archiver =
        [ common.get-invocation-command darwin
            : libtool : [ feature.get-values <archiver> : $(options) ] : $(bin) : search-path ] ;
    flags darwin.archive .LIBTOOL $(condition) : $(archiver[1]) ;
    if $(.debug-configuration)
    {
        ECHO notice\: using archiver for $(condition) at $(archiver[1]) ;
    }

    # - Initialize the SDKs available in the root for this tool.
    local sdks = [ init-available-sdk-versions $(condition) : $(root) ] ;

    #~ ECHO --- ;
    #~ ECHO --- bin :: $(bin) ;
    #~ ECHO --- root :: $(root) ;
    #~ ECHO --- version :: $(version) ;
    #~ ECHO --- condition :: $(condition) ;
    #~ ECHO --- strip :: $(strip) ;
    #~ ECHO --- archiver :: $(archiver) ;
    #~ ECHO --- sdks :: $(sdks) ;
    #~ ECHO --- ;
    #~ EXIT ;
}

# Add and set options for a discovered SDK version.
local rule init-sdk ( condition * : root ? : version + : version-feature ? )
{
    local rule version-to-feature ( version + )
    {
        switch $(version[1])
        {
            case appletv* :
            {
                return $(version[1])-$(version[2-]:J=.) ;
            }
            case iphone* :
            {
                return $(version[1])-$(version[2-]:J=.) ;
            }
            case mac* :
            {
                return $(version[2-]:J=.) ;
            }
            case * :
            {
                return $(version:J=.) ;
            }
        }
    }

    if $(version-feature)
    {
        if $(.debug-configuration)
        {
            ECHO notice\: available sdk for $(condition)/<macosx-version>$(version-feature) at $(root) ;
        }

        # Add the version to the features for specifying them.
        if ! $(version-feature) in [ feature.values macosx-version ]
        {
            feature.extend macosx-version : $(version-feature) ;
        }
        if ! $(version-feature) in [ feature.values macosx-version-min ]
        {
            feature.extend macosx-version-min : $(version-feature) ;
        }

        # Set the flags the version needs to compile with, first
        # generic options.
        flags darwin.compile OPTIONS $(condition)/<macosx-version>$(version-feature)
            : -isysroot $(root) ;
        flags darwin.link OPTIONS $(condition)/<macosx-version>$(version-feature)
            : -isysroot $(root) ;

        # Then device variation options.
        switch $(version[1])
        {
            case appletvsim* :
            {
                local N = $(version[2]) ;
                if ! $(version[3]) { N += 00 ; }
                else if [ regex.match (..) : $(version[3]) ] { N += $(version[3]) ; }
                else { N += 0$(version[3]) ; }
                if ! $(version[4]) { N += 00 ; }
                else if [ regex.match (..) : $(version[4]) ] { N += $(version[4]) ; }
                else { N += 0$(version[4]) ; }
                N = $(N:J=) ;
                flags darwin.compile OPTIONS <macosx-version-min>$(version-feature)
                    : -D__IPHONE_OS_VERSION_MIN_REQUIRED=$(N) ;
                flags darwin.link OPTIONS <macosx-version-min>$(version-feature)
                    : -D__IPHONE_OS_VERSION_MIN_REQUIRED=$(N) ;
            }

            case appletv* :
            {
                flags darwin.compile OPTIONS <macosx-version-min>$(version-feature)
                    : -mtvos-version-min=$(version[2-]:J=.) ;
                flags darwin.link OPTIONS <macosx-version-min>$(version-feature)
                    : -mtvos-version-min=$(version[2-]:J=.) ;
            }

            case iphonesim* :
            {
                local N = $(version[2]) ;
                if ! $(version[3]) { N += 00 ; }
                else if [ regex.match (..) : $(version[3]) ] { N += $(version[3]) ; }
                else { N += 0$(version[3]) ; }
                if ! $(version[4]) { N += 00 ; }
                else if [ regex.match (..) : $(version[4]) ] { N += $(version[4]) ; }
                else { N += 0$(version[4]) ; }
                N = $(N:J=) ;
                flags darwin.compile OPTIONS <macosx-version-min>$(version-feature)
                    : -D__IPHONE_OS_VERSION_MIN_REQUIRED=$(N) ;
                flags darwin.link OPTIONS <macosx-version-min>$(version-feature)
                    : -D__IPHONE_OS_VERSION_MIN_REQUIRED=$(N) ;
            }

            case iphone* :
            {
                flags darwin.compile OPTIONS <macosx-version-min>$(version-feature)
                    : -miphoneos-version-min=$(version[2-]:J=.) ;
                flags darwin.link OPTIONS <macosx-version-min>$(version-feature)
                    : -miphoneos-version-min=$(version[2-]:J=.) ;
            }

            case mac* :
            {
                flags darwin.compile OPTIONS <macosx-version-min>$(version-feature)
                    : -mmacosx-version-min=$(version[2-]:J=.) ;
                flags darwin.link OPTIONS <macosx-version-min>$(version-feature)
                    : -mmacosx-version-min=$(version[2-]:J=.) ;
            }
        }

        if $(version[3]) > 0
        {
            # We have a minor version of an SDK. We want to set up
            # previous minor versions, plus the current minor version.
            # So we recurse to set up the previous minor versions, up to
            # the current version.
            local minor-minus-1 = [ CALC $(version[3]) - 1 ] ;
            return
                [ init-sdk $(condition) : $(root)
                    : $(version[1-2]) $(minor-minus-1) : [ version-to-feature $(version[1-2]) $(minor-minus-1) ] ]
                $(version-feature) ;
        }
        else
        {
            return $(version-feature) ;
        }
    }
    else if $(version[4])
    {
        # We have a patch version of an SDK. We want to set up
        # both the specific patch version, and the minor version.
        # So we recurse to set up the patch version. Plus the minor version.
        return
            [ init-sdk $(condition) : $(root)
                : $(version[1-3]) : [ version-to-feature $(version[1-3]) ] ]
            [ init-sdk $(condition) : $(root)
                : $(version) : [ version-to-feature $(version) ] ] ;
    }
    else
    {
        # Yes, this is intentionally recursive.
        return
            [ init-sdk $(condition) : $(root)
                : $(version) : [ version-to-feature $(version) ] ] ;
    }
}

# Determine the MacOSX SDK versions installed and their locations.
local rule init-available-sdk-versions ( condition * : root ? )
{
    root ?= /Developer ;
    local sdks-root = $(root)/SDKs ;
    local sdks = [ GLOB $(sdks-root) : MacOSX*.sdk AppleTVOS*.sdk AppleTVSimulator*.sdk iPhoneOS*.sdk iPhoneSimulator*.sdk ] ;
    local result ;
    for local sdk in $(sdks)
    {
        local sdk-match = [ MATCH "([^0-9]+)([0-9]+)[.]([0-9x]+)[.]?([0-9x]+)?" : $(sdk:D=) ] ;
        local sdk-platform = $(sdk-match[1]:L) ;
        local sdk-version = $(sdk-match[2-]) ;
        if $(sdk-version)
        {
            switch $(sdk-platform)
            {
                case macosx :
                {
                    sdk-version = mac $(sdk-version) ;
                }
                case appletvos :
                {
                    sdk-version = appletv $(sdk-version) ;
                }
                case appletvsimulator :
                {
                    sdk-version = appletvsim $(sdk-version) ;
                }
                case iphoneos :
                {
                    sdk-version = iphone $(sdk-version) ;
                }
                case iphonesimulator :
                {
                    sdk-version = iphonesim $(sdk-version) ;
                }
                case * :
                {
                    sdk-version = $(sdk-version:J=-) ;
                }
            }
            result += [ init-sdk $(condition) : $(sdk) : $(sdk-version) ] ;
        }
    }
    return $(result) ;
}

rule compile.m ( targets * : sources * : properties * )
{
    LANG on $(<) = "-x objective-c" ;
    gcc.set-fpic-options $(targets) : $(sources) : $(properties) ;
}

actions compile.m
{
    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
}

rule compile.mm  ( targets * : sources * : properties * )
{
    LANG on $(<) = "-x objective-c++" ;
    gcc.set-fpic-options $(targets) : $(sources) : $(properties) ;
}

actions compile.mm
{
    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
}

# Set the max header padding to allow renaming of libs for installation.
flags darwin.link.dll OPTIONS : -headerpad_max_install_names ;

# To link the static runtime we need to link to all the core runtime libraries.
flags darwin.link OPTIONS <runtime-link>static
    : -nodefaultlibs -shared-libgcc -lstdc++-static -lgcc_eh -lgcc -lSystem ;

# Strip as much as possible when optimizing.
flags darwin.link OPTIONS <optimization>speed : -Wl,-dead_strip -no_dead_strip_inits_and_terms ;
flags darwin.link OPTIONS <optimization>space : -Wl,-dead_strip -no_dead_strip_inits_and_terms ;

# Dynamic/shared linking.
flags darwin.compile OPTIONS <link>shared : -dynamic ;

# Misc options.
flags darwin.compile OPTIONS : -gdwarf-2 -fexceptions ;
#~ flags darwin.link OPTIONS : -fexceptions ;

# Add the framework names to use.
flags darwin.link FRAMEWORK <framework> ;

#
flags darwin.link FORCE_LOAD <force-load> ;

# This is flag is useful for debugging the link step
# uncomment to see what libtool is doing under the hood
#~ flags darwin.link.dll OPTIONS : -Wl,-v ;

# set up the -F option to include the paths to any frameworks used.
local rule prepare-framework-path ( target + )
{
    # The -framework option only takes basename of the framework.
    # The -F option specifies the directories where a framework
    # is searched for.  So, if we find <framework> feature
    # with some path, we need to generate property -F option.
    local framework-paths = [ on $(target) return $(FRAMEWORK:D) ] ;

    # Be sure to generate no -F if there's no path.
    for local framework-path in $(framework-paths)
    {
        if $(framework-path) != ""
        {
            FRAMEWORK_PATH on $(target) += -F$(framework-path) ;
        }
    }
}

rule link ( targets * : sources * : properties * )
{
    DEPENDS $(targets) : [ on $(targets) return $(FORCE_LOAD) ] ;
    prepare-framework-path $(<) ;
}

# Note that using strip without any options was reported to result in broken
# binaries, at least on OS X 10.5.5, see:
#    http://svn.boost.org/trac/boost/ticket/2347
# So we pass -S -x.
actions link bind LIBRARIES FORCE_LOAD
{
    "$(CONFIG_COMMAND)" -L"$(LINKPATH)" -o "$(<)" "$(>)" -Wl,-force_load$(_)"$(FORCE_LOAD)" "$(LIBRARIES)" -l$(FINDLIBS-SA) -l$(FINDLIBS-ST) $(FRAMEWORK_PATH) -framework$(_)$(FRAMEWORK:D=:S=) $(OPTIONS) $(USER_OPTIONS)
    $(NEED_STRIP)"$(.STRIP)" $(NEED_STRIP)-S $(NEED_STRIP)-x $(NEED_STRIP)"$(<)"
}

rule link.dll ( targets * : sources * : properties * )
{
    prepare-framework-path $(<) ;
}

actions link.dll bind LIBRARIES
{
    "$(CONFIG_COMMAND)" -dynamiclib -Wl,-single_module -install_name "$(<:B)$(<:S)" -L"$(LINKPATH)" -o "$(<)" "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-SA) -l$(FINDLIBS-ST) $(FRAMEWORK_PATH) -framework$(_)$(FRAMEWORK:D=:S=) $(OPTIONS) $(USER_OPTIONS)
}

# We use libtool instead of ar to support universal binary linking
# TODO: Find a way to use the underlying tools, i.e. lipo, to do this.
actions piecemeal archive
{
    "$(.LIBTOOL)" -static -o "$(<:T)"  $(ARFLAGS)  "$(>:T)"
}
